EP0852679A1 - Sicherheitssystem für ein automatgetriebe - Google Patents
Sicherheitssystem für ein automatgetriebeInfo
- Publication number
- EP0852679A1 EP0852679A1 EP96933381A EP96933381A EP0852679A1 EP 0852679 A1 EP0852679 A1 EP 0852679A1 EP 96933381 A EP96933381 A EP 96933381A EP 96933381 A EP96933381 A EP 96933381A EP 0852679 A1 EP0852679 A1 EP 0852679A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control unit
- transmission
- parameters
- parameter
- clutch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H59/70—Inputs being a function of gearing status dependent on the ratio established
- F16H2059/706—Monitoring gear ratio in stepped transmissions, e.g. by calculating the ratio from input and output speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1244—Keeping the current state
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/1276—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a friction device, e.g. clutches or brakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/38—Inputs being a function of speed of gearing elements
- F16H59/40—Output shaft speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/38—Inputs being a function of speed of gearing elements
- F16H59/42—Input shaft speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/46—Inputs being a function of speed dependent on a comparison between speeds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/68—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings
- F16H61/684—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive
- F16H61/686—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive with orbital gears
Definitions
- the invention relates to a safety system for an automatic transmission in which an error in the disengaging clutch or brake is detected for an upshift or downshift if the amount of the difference between the time profiles of the transmission input speed and the product of the transmission output speed times the first transmission ratio does not increase continuously .
- automatic transmission is to be understood as being an electrohydraulically controlled automatic transmission in which the shift is designed as an overlap shift. In the case of overlapping circuits, this takes place
- the object of the invention is therefore to provide a safety system for an automatic transmission which includes a defective opening of the disengaging clutch or brake is detected.
- the object is achieved according to the invention in that the electronic control unit calculates, cyclically from the measured transmission output speed as the first characteristic variable Gl, the product of the transmission output speed times the first gear ratio, and measures the transmission input speed as the second characteristic variable G2.
- the time profile is determined from two successive values by forming the difference.
- the electronic control unit detects a fault in the opening clutch or brake if the amount of the difference in the time profiles does not increase after the load has been taken over.
- the first and second parameters are each surrounded by an envelope.
- a fault is present if the envelopes still overlap after the load has been taken over, so that values of the two parameters Gl, G2 within the envelopes represent the defective area and values outside the envelopes represent the error-free area.
- This embodiment offers the advantage that tolerances of the speed sensors are not immediately assessed as a fault in the opening clutch or brake.
- 1 shows a system diagram of an automatic transmission
- Fig. 2 clutch-brake logic of the automatic transmission
- Fig. 3 ideal time course of the first and second parameters for an upshift
- Fig. 4 ideal time course of the first and second parameters for a Pdownshift
- Fig. 6 diagram, number of successful / unsuccessful test conditions.
- the automatic transmission 2 consists of a hydrodynamic converter 7, a composite planetary gear 11 with differential 12, a hydraulic control unit 4 and an electronic control unit 5.
- An internal combustion engine 1 drives the automatic transmission 2 via the drive shaft 6.
- An electronic engine control advises 3 controls or regulates the internal combustion engine 1.
- the drive shaft 6 is rotatably connected to the hydrodynamic converter 7 and drives its pump wheel 8.
- the hydrodynamic converter 7 consists of the pump wheel 8, a turbine wheel 9 and a stator 10.
- a converter lock-up clutch is shown without reference numerals. When the converter lock-up clutch is actuated, the turbine shaft rotates at the same speed as the drive shaft 6.
- the composite planetary gear 11 consists of two planetary gear pairs and the clutches or brakes B to F. The corresponding gear assignment to the clutch / brake combination is off Fig. 2 can be seen.
- the output takes place via the differential 12 and the two axle half-shafts 13A and 13B. Since the mechanical part to the further
- the clutches and brakes B to F are controlled or regulated by the electronic control unit 5 via the hydraulic control unit 4.
- the electronic control unit 5 shows the function blocks micro-controller 14, memory 15, function block calculation 17 and function block control actuators 16 in a greatly simplified form.
- the memory 15 is usually designed as an EPROM or as a buffered RAM.
- the transmission-relevant data are stored in the memory 15.
- the function block control actuators 16 is used to control the electromagnetic actuators in the hydraulic control unit 4.
- the function block calculation 17 is used to calculate the circuit-relevant data. These are determined from the input variables 18 to 21. Input variables are 20 z. B.
- the electronic engine control unit 3 and the electronic control unit 5 are connected to one another via a data line 21.
- This data line 21 can be designed as a single-wire interface in order to e.g. B. perform an engine intervention.
- the data line 21 can also be used as a bidirectional data line for a bus system, e.g. B. CAN bus. Additional input variables for the
- Control unit 5 are the transmission input speed 18 and the transmission output speed 19.
- dGl Gl (t2) - Gl (tl)
- dG2 G2 (t2) - G2 (tl)
- the process is repeated at a third point in time t3, which results in points C and F.
- the second clutch has taken over the load from the first clutch.
- the temporal course of the second parameter G2 changes.
- the calculated values of the first parameter Gl remain almost constant, since the transmission output speed remains almost constant.
- the amount of the difference values of the first and second parameters are related to each other. For the query time t3, this corresponds to the distance from point C to point F. If the circuit proceeds properly, the amount increases. 3 additionally shows two hysteresis bands which surround the ideal course of the first and second parameters.
- the upper limit for the hysteresis band is marked with the reference symbol 24 and the lower limit with the reference symbol 25.
- reference numeral 22 shows the upper limit and reference numeral 23 accordingly the lower limit. This has the advantage that measurement errors or disturbances on the speed signals do not prevent the detection of an error.
- the bandwidth of the hysteresis is obtained from tests and is z. B. +/- 100 revolutions.
- FIG. 4 shows an ideal course of the two parameters G1 and G2 for a downshift.
- the time is plotted on the abscissa
- 3 applies to the calculation of the two parameters and the method.
- 5A shows the course of the two parameters G1 and G2 for a faulty upshift.
- the second parameter G2 is designated here as G2 '.
- the envelopes of the two parameters remain overlapped even after the load has been transferred.
- a first cause of the error may be that the clutch or brake that is disengaging does not open properly.
- a second cause of the fault is if the clutch is too low in pressure. As a result, the engaging clutch cannot take over the load from the disengaging clutch. Both causes of error result in a flatter course of the second parameter G2 'compared to the course of the second parameter G2 with a correct switching.
- 5B shows a further faulty upshift.
- the error manifests itself in the fact that the values of the first parameter G1, here referred to as G1, are below the values of the second parameter G2. This is the case when there are strongly fluctuating changes in the coefficient of friction on the drive wheels of the vehicle, e.g. B. slip occurs.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19536339A DE19536339A1 (de) | 1995-09-29 | 1995-09-29 | Sicherheitssystem für ein Automatgetriebe |
DE19536339 | 1995-09-29 | ||
PCT/EP1996/004180 WO1997013083A1 (de) | 1995-09-29 | 1996-09-25 | Sicherheitssystem für ein automatgetriebe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0852679A1 true EP0852679A1 (de) | 1998-07-15 |
EP0852679B1 EP0852679B1 (de) | 2000-03-29 |
Family
ID=7773591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96933381A Expired - Lifetime EP0852679B1 (de) | 1995-09-29 | 1996-09-25 | Sicherheitssystem für ein automatgetriebe |
Country Status (6)
Country | Link |
---|---|
US (1) | US5991679A (de) |
EP (1) | EP0852679B1 (de) |
JP (1) | JPH11513466A (de) |
KR (1) | KR19990063725A (de) |
DE (2) | DE19536339A1 (de) |
WO (1) | WO1997013083A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19807349A1 (de) | 1998-02-20 | 1999-08-26 | Zahnradfabrik Friedrichshafen | Verfahren zur Steuerung eines automatischen Getriebes |
DE19807346A1 (de) | 1998-02-20 | 1999-08-26 | Zahnradfabrik Friedrichshafen | Verfahren zur Steuerung eines automatischen Getriebes |
DE19807357A1 (de) | 1998-02-20 | 1999-08-26 | Zahnradfabrik Friedrichshafen | Verfahren zur Steuerung eines automatischen Getriebes |
US7310952B2 (en) * | 2003-10-17 | 2007-12-25 | General Electric Company | Methods and apparatus for attaching swirlers to gas turbine engine combustors |
JP4975041B2 (ja) * | 2006-11-30 | 2012-07-11 | 日立建機株式会社 | 産業車両の変速制御装置 |
EP2098761B1 (de) * | 2006-11-30 | 2012-08-22 | Hitachi Construction Machinery Co., Ltd. | Gangwechselsteuersystem für nutzfahrzeug |
DE102007051064B4 (de) * | 2007-10-17 | 2010-02-11 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Fehlererkennungsverfahren für automatisierte Kraftfahrzeuggetriebe |
DE102011017741B4 (de) | 2011-04-29 | 2024-05-23 | Zf Friedrichshafen Ag | Verfahren zum Überwachen eines Schaltablaufs eines automatischen Getriebes |
DE102012201145A1 (de) * | 2012-01-26 | 2013-08-01 | Zf Friedrichshafen Ag | Verfahren zum Überprüfen eines Notlaufzustandes bei einem Getriebe |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0788896B2 (ja) * | 1986-08-11 | 1995-09-27 | アイシン・エィ・ダブリュ株式会社 | 誤変速防止機能を備えた自動変速機 |
US4779490A (en) * | 1987-09-28 | 1988-10-25 | Saturn Corporation | Output speed sensor diagnostic control for a motor vehicle transmission |
JP2913481B2 (ja) * | 1989-05-19 | 1999-06-28 | アイシン精機株式会社 | 自動変速機の油圧制御装置 |
JPH02304261A (ja) * | 1989-05-19 | 1990-12-18 | Nissan Motor Co Ltd | 自動変速機のライン圧制御装置 |
US5046175A (en) * | 1990-01-11 | 1991-09-03 | General Motors Corporation | Method of detecting clutch tie-up during transmission shifting |
GB9001273D0 (en) * | 1990-01-19 | 1990-03-21 | Eaton Corp | Control and method for controlling amt system including in-gear fault detection & tolerance |
US5487004A (en) * | 1993-10-29 | 1996-01-23 | Eaton Corporation | Control system/method for automated mechanical transmission systems |
JP3007547B2 (ja) * | 1994-12-28 | 2000-02-07 | 本田技研工業株式会社 | 車両用油圧作動式変速機の油圧制御装置 |
US5680307A (en) * | 1995-06-28 | 1997-10-21 | Chrysler Corporation | Method of shifting in a manual mode of an electronically-controlled automatic transmission system |
JP3470504B2 (ja) * | 1996-05-10 | 2003-11-25 | トヨタ自動車株式会社 | 自動変速機の変速制御装置 |
-
1995
- 1995-09-29 DE DE19536339A patent/DE19536339A1/de not_active Withdrawn
-
1996
- 1996-09-25 WO PCT/EP1996/004180 patent/WO1997013083A1/de not_active Application Discontinuation
- 1996-09-25 JP JP9513941A patent/JPH11513466A/ja active Pending
- 1996-09-25 US US09/000,352 patent/US5991679A/en not_active Expired - Fee Related
- 1996-09-25 EP EP96933381A patent/EP0852679B1/de not_active Expired - Lifetime
- 1996-09-25 DE DE59604848T patent/DE59604848D1/de not_active Expired - Lifetime
- 1996-09-25 KR KR1019980702192A patent/KR19990063725A/ko not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9713083A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19536339A1 (de) | 1997-04-03 |
WO1997013083A1 (de) | 1997-04-10 |
KR19990063725A (ko) | 1999-07-26 |
DE59604848D1 (de) | 2000-05-04 |
JPH11513466A (ja) | 1999-11-16 |
US5991679A (en) | 1999-11-23 |
EP0852679B1 (de) | 2000-03-29 |
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